Core-chuck.



F. W. KREMER. COR-E CHUCK.

APPLIGATION FILED FEB. 8. 1911.

1,008,652. Patented Nov. 14, 1911.

2 BHEETS-SHEET 1.

Mtorneys F. W. KREMER.

GORE'GHUGK.

APPLICATION FILED IEB.8. 1911.

1,008,652, 1 Patented Nov, 14, 1911.

2SHEBTS-SHBET 2.

Inventor Wit ess v Attorneys UNITED STATES TENT-orFioEf FRANKLIN WILLIAM .lKREMiER, or eAsL T'Ammw JERSEY.

. Conn-oration.

To all whom zt may concern:

Be-it' l m'-own that I, FRA KLIN V. KRE- MER, a'citizen of the United States, residing at Carlstadt, in the county of Bergen and State of New Jersey, have invented a new and useful Core-Chuck, of which the following is a specification.

The device forming the subject matter of Lthisp'atent, is a chuck, adapted-for holding and securing the cores or building forms used in the construction of vehicle tires.

' Chucks of this character, as at present constructed, embrace a plurality of radially moving supporting elements, adapted to engage the core, each" of these -supportingelements requiring 1 separate adjustment,

whereby much time is consumed in securing the core in place and in truing up the core.

It is the object of the present invention to provide a chuck, the radial arms of which will be advanced simultaneously by the rotation of a cam member, suitably housed'in the body of the chuck, and accessible from the exterior of the body-of the chuck.

A further object of the invention to provide novel means 'whereby the chuck may be supported, and to provide novel means for operating the cam member, novel means being provided for holding the cam member against movement? With the foregoing and other objects in View which will appear as the description proceeds, the invention resides in the .combination and arrangement of parts and in the details of construction hereinafter described, and claimed, it being understood that changes in the precise embodiment of invention herein disclosed can be made within the scope of what is ,claimed' without departing from'thespirit of the invention.

In the drawing's,Figure' 1' 1s a rear elevation; Fig. 2 is a' front elevation; F ig. 3

is a-transverse section upon the line A-B of Fig. 2; Fig. 4 isanelevation of the cam member;"and Fig. 5 isl'a 'detalled perspective of one of the arms which are advanced longitudinally, and radially of the chuck, by the cammember shown in Fig. 4;. v

The body of the chuck conslsts of a back plate l and a front plate 2, the latter hav ing' "an outstanding peripheral flange 3, adapted to bear 'against the back plate, to space the back plate and the front plate slightlyapart. Screws 45,01 other connect- 'ing elements adapted to i igaa like end are extended through the front plate 2, in the Specification of Letters Patent.

flange portion 3' thereof, to engage the back plate 1, to hold the constituent elementsof the body together.

The back plate 1 is supplied centrally with a hub 5, protruding beyond both faces of the back plate, the .hub being provided .adjacent one end with a reduced neck 6,

defining a shoulder in the hub. It is against this shoulder that the front plate 2 rests, in its central portion. A supporting arm 7 of any desired form, is inserted through the hub5' and the .neck' 6, the arm 7being preferably threaded-to receive a nu't8.

1 Disposed between the-plates1 aiid2,and

rotatably mounted upon the hub 15, is a cam plate 9, seen in clearest detail 4, the cam plate being provided with a cen- Patented Nov.'14, 1911. Application filed February-8, 1911. Serial No. 607,275.

tral opening 10 to receivethe hub." 'Inth'e cam plate 9 there are cam slots 11', each cam none of which centers of curvature coincide with the axisv ofrotation of the cam plate 9.

.75 slot having its peculiar center of curvature',. Y

The back plate 1 is provided with a series i of radially disposed, outstandingribs 17,

defining grooves 16 in the inner face of the back plate. In the grooves 16, arms 15 are mounted. for longitudinal sliding movement, radially of the back plate 1, the arms 15 carrying at their inner ends, rollers 12, held in place upon the arms by screws 14,"'or

other securing elements, the rollers 12 being .adapt edto ride. in the cam slots 11 ofthe plate 9. The arms 15 are terminally provided with enlarged heads 15, having terminal grooves 20, these grooves preferably circumferentially of the body of extending the chuck. i 1

' In the front plate 2 there'is an arcuate slot 23, the center of curvature of which coincides with the axis of rotation ofthe cam plate 9, the construction above referred or the like, the plate 21 being equipped with an outstandinghandle 24, ,pro ecting beyond the front plate :2. .'Mounted in the back platel, adjacent theperiphery thereof, and engaging the cam plate 9, is a set screw 25,.or other clamping element, whereby-the rotation of the cam plate may be prevented.

In practical operation, the set screw 25 is manipulated, setting the cam plate 9 free for rotation upon the hub 5. The handle 24 Y is then swung in the direction of the arrow its in Fig. 2, rotating the cam plate in a corresponding direction. The rollers 12 upon the arms 15. will move in the cam slots 11 of the cam plate 9 in the direction of the arrows in Fig. 4, the arms 15 sliding inwardly, in the grooves 16, toward the axis ofvthe structure. \Vhen the arms have been retracted to the desired extent, the core is alined with the arms, whereupon the cam plate 9 is rotated in a direction opposite to that above referred to, all of. the arms 15 being advanced simultaneously, away from the 'axis of the structure, the supporting core being engaged in the grooves20 formed 'in the 'ends of the arms 15. Since arms 15 are advanced simultaneously, and to the same extent, the supporting core'is held firmly in place, properly centered. By reason of the fact that the plate 21, carrying thehandle 24:, is of the same curvature as the slot 23 in the front plate 2, and by reason of the further fact that this plate 21 moves'inthe slot 23 in close contact with the front plate, the-element 21 serves as a guide, maintaining the cam plate9 properly positioned with respect to the other parts of the chuck, the plate 21, of course,

"cooperating with the hub 5 to produce this result.

Having thus described the invention, what,

is claimed is:

bodycomprising a front plate having an arcuate slot; acam member mounted for rotation in the body, the axis of rotation of.

the cam member coinciding with the center of-curvature of the slot; an arcuate plate .secured to the cam member and moving in the slot, the said plate having a. common radius of curvature with the slot andconstituting a guidefor the cam member; a handle carried by the arouate plate; and radially slidable arms located in the body and engageable by the cam member foradvancement and retraction.

2. In a device of the class described, a back. plate having radial. ribs defining grooves in the inner face of the back plate the back plate being providedfwith s, cmtrally disposed hub; a front. plate having an outstanding flange adapted to engage the back plate to space the back plate and the front plate apart; means located in said flange for securing the {plates together; a-.

cam plate rotatably mounted upon the hub, between the front plate and the back plate, the cam plate having curvilinear slots ec centric with respect to the axis of rotation of the cam plate arms 'slidable in the grooves; rollers upon the arms adapted to ride in the slots of the cam plate; a handle protruding through the front plate, a clamping member' mounted 1n the back plate and adapted to engage the cam plate;

and a support carried by the hub.

In testimony that I claim the foregoing as'myown, I have hereto atfixed my slgna- 1. In a device'ofl the class described, a-

ture in the presence of two witnesses.

. FRANKLIN WILLIAM KREMER" lVitnesses FRANK Dn Wrr'r, J, A. MILLER. 

